Greetings! I recently purchased and installed a new BTA6100 in the trunk of my 2006 goldwing. I'd say it is a definate upgrade to the sound while in the garage and riding around town at up to ~45 MPH. At highway speed I can't hear or feel the bass. I'm wondering if upgrading to the 6250 or 8250 would improve the sound while riding on the highway or not...Any advice? The whole trunk is almost gone with the 6100, might as well eat up whats left in the name of THUMP!